Lessons of the Winburg Mini Case Study In the real world,Changes are always needed The real world is continually changing Information technology professionals are human,so we make mistakes Man cannot escape mistakes Faults must be fixed quickly If not,it will be carried over into the next phase -60~70%of all detected faults are requirements, analysis,and design faultsSlide 2.13 13/50 Lessons of the Winburg Mini Case Study In the real world, Changes are always needed – The real world is continually changing – Information technology professionals are human, so we make mistakes Man cannot escape mistakes Faults must be fixed quickly – If not, it will be carried over into the next phase – 60 ~ 70% of all detected faults are requirements, analysis, and design faults